NAICS 237990: Other Heavy and Civil Engineering Construction
This industry comprises establishments primarily engaged in heavy and civil engineering construction projects (excluding highway, street, bridge, and distribution line construction).  The work performed may include new work, reconstruction, rehabilitation, and repairs.  Specialty trade contractors are included in this industry if they are engaged in activities primarily related to heavy and civil engineering construction projects (excluding highway, street, bridge, distribution line, oil and gas structure, and utilities building and structure construction).  Construction projects involving water resources (e.g., dredging and land drainage), development of marine facilities, and projects involving open space improvement (e.g., parks and trails) are included in this industry.

Illustrative Examples:

Channel construction
Land drainage contractors
Dam construction
Marine construction
Dock construction
Microtunneling contractors
Dredging (e.g., canal, channel, ditch, waterway)
Nuclear waste disposal site construction
Earth retention system construction
Flood control project construction
Park ground and recreational open space improvement construction
Railroad construction
Golf course construction
Subway construction
Horizontal drilling (e.g., cable, pipeline, sewer installation)
Trenching, underwater
Hydroelectric generating station construction
Tunnel construction 

ExioML sector: Construction work (45)
Region: US | Year: 2022
Sector value added: 916907.924103 M EUR | Employment: 17329.2593376 thousand persons
Sector GHG emissions: 49388377293.7 kg CO2 eq | Energy carrier net total: 903450.264368 TJ | Carbon intensity: 0.05386405329849892

Company: Helix Enrgy Slutions Group Inc
Helix Energy Solutions Group, Inc. is an international offshore energy company. It focuses on subsea construction, maintenance and salvage services to the offshore natural gas and oil industry.